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■ Oscillation Stabilization Time Timer Function
The time-base timer is also used as the oscillation stabilization time timer for oscillation and the PLL
clocks.
The oscillation stabilization time is set for the interval from the time the counter counts up from "0" (count
clear) until the oscillation stabilization time bit overflows. When control returns from time-base timer
mode to PLL clock mode, the oscillation stabilization time starts from the middle of counting because the
time-base timer counter has been not cleared. Table 10.5-1 shows the clearing of the time-base counter and
the oscillation stabilization times.
Table 10.5-1 Time-base Timer Counter Clearing and Oscillation Settling Times
Operation
TBTC: Writing of 0 to TBR
Power-on reset
Watchdog reset
Releasing of stop mode
Transition from oscillation clock mode
to PLL clock mode (MCS = 1 → 0)
Releasing of time-base timer mode
Releasing of sleep mode
O: Available
X: Not available
■ Clock Supply Function
The time-base timer supplies clocks to the watchdog timer. Clearing of the time-base counter affects
operation of the watchdog timer.
Counter clear
TBOF clear
O
O
O
O
O
O
O
O
X
X
X
X
CHAPTER 10 TIME-BASE TIMER
Oscillation settling time
Oscillation clock oscillation stabilization time
Oscillation clock oscillation stabilization time
(at return to main clock mode)
PLL clock oscillation stabilization time
PLL clock oscillation stabilization time (at
return to PLL clock mode)
213
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